Over the years, quite a few theremin designs have been drawn. Their quality varies from toy or gadget devices via hobby theremins to carefully designed instruments. I've tried to put each circuit diagram in the appropriate category. A special category is that of the vintage theremins, like the RCA theremin. And then there are, some even modern, vacuum tube theremin designs. You can use these schematic diagrams to build your own theremin or for reference when you wish to design or modify one. However, if you're not experienced in electronics you are probably better off with a theremin kit. (Max Baars)

This document was found by John Snyder during his Caramoor research many years ago. Lucy Rosen maintained two custom theremins made for her by Professor Theremin. The typewritten photocopies John rescued were apparently originally transcribed from shorthand notes.

In this article Giorgio Necordi examines the technology behind the Theremin and outlines the differences between tubes and transistor technology. Then he describes his project for a new transistor Theremin.